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Ответ:

3. 1) 4m• (–2,5)= –10

2) –p•(–2m)= 2mp

4. 1) 1,7x–1,8y+1,9x–2y= 3,6x–3,8y

2) 14–2a+3a–8= 6+a

5. 1) 3(2a–5)–2(a–3)= 6a–15–2a+6= 4a–9

2)–(2x–1)+2(x–7)= 2x+1+2x–14= 4x–13

6. 0,4(b–5)–0,6(10–b)= 0,4b–2–6+0,6b= 1b–8= 1•7,2–8= –0,8